NO!
It's Like Trying to Change what happened to Boromir.
If they want to rewrite the book they are no “fans”.
Nooooo!
That ruins the whole ending, with its connections to the death of Beowulf and how everything is going to go downhill from there, heroic-myth-wise.
I like the movie Thorin as well as any healthy middle-aged lady, but dang it, he’s supposed to be a white-bearded bicentenarian.
I had never read The Hobbit; but, tried to tackle it recently. I accepted the fate of Thorin Oakenshield, it seemed inevitable considering the influence he was under. I was bummed, however, that he took Kili and Fili with him. That doesn't mean I liked losing Thorin, I just accepted the writer's story. I had forgotten Boromir from LOTRs; but, that is a good analogy.
Perhaps it is the times we live in, and the entertainment that we see these days, that makes us want to change things so that the outcome is not so dire. Boromir was affected by The One Ring of Power; but, his death redeemed him in a way and he remained a Hero. He could not defeat death; but, he defeated the "Darkness".